<?php
$a=array("a"=>"red","b"=>"green");
$b=array("c"=>"red","d"=>"yellow");
$z=$a+$b;
$c="1 2hello 6";
$d=10;
var_dump($z);
echo "<br>";
var_dump($a==$b);
echo"<br>";
var_dump($a!==$b);
echo"<br>";
var_dump($a!=$b);
echo"<br>";
var_dump($a===$b);
echo"<br>";
echo $c.$d;
?>